Sand drying device



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SAND DRYING DEVICE Fil ed June 7, 1952 Patented July 16, 1935 UNITED STATES SAND DRYING DEVICE George A. Diehl,

Cumberland, Md; I

Application June 7, 1932, Serial No. 615,909

1 Claim.

Generically this invention relates to driers, but it more especially is directed to such an apparatus applicable to the drying of sand and the like. a i

One of the principal objects of this invention is the provision of a sand drying apparatus including a heating unit embracing a specially designed firebox, wherein flue spaces are provided between the side walls and the firefor directing the flames against said side walls, and battle means for distributing the heat and retarding the discharge from the firebox. a

Another important object of this invention is the provision of a sand drying device of this character comprising a unique hopper and firebox protective structure, and novel means including rotatable grates for eifecting the automatic discharge of the dried product and preventing the clogging of the same at points of discharge from the device.

With these and other objects in view, which will become apparent as thedescription proceeds,

invention resides in the construction, combination and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawing, in which like characters of reference indicate, like parts through out the several figures, of which:

Fig. I: is a vertical cross sectional View of my improved device;

Fig. 2 is a longitudinal sectional view of the same; and

Fig. 3 is a horizontalsection on the lines 33 of Fig. 2.

The driers of this general character with which I am familiar have proven deficient by reason of being too costly and complex in structure, not uniformly drying the product being directed to the discharge points, and inabilityto effect. the expeditious removal of extraneous matter tending to prevent the automatic or continuous discharge of the dried material, and it was to overcome such deficiencies and provide a device having a firebox with tapering walls to direct and cause the flames to contact and follow the inner surfaces thereof, means to distribute the heat and retard its escape, adequate and properly proportioned discharge openings, unique hopper and firebox protective structure, and movable grate means contiguous the discharge openings to expeditiously prevent clogging of the material at such points and efiect the removal of such extraneous matter in the sand or other material being treated as would tend to interrupt the proper flow of the dried product, that I designed the drier forming the subjectmatter of this invention. d The frame A, in the present instance, is rectan gular in configuration and comprises a front casting I formed with legs 2, terminating at its upper edge in the oppositely extending lateral projec tions 3, and with a central opening t normally closed by door 5, and a rear casting 6 formed with legs 2 and lateral projection 3 similar to front casting l and also terminating at its upper edge'in' an outwardly projecting lateral flange i constituting a sheli or soot trap, as will hereinafter more fully appear. I

' The castings l and 6 are connected at opposite sides by the respective angle bars 8 supported by and suitably secured to angle lugs 9 bolted or otherwise connected to the respective castings. desired, these lugs may be integrally cast with the front and rear castings. Said castings l and 5 are connected at their upper edges by angle bars ll seating on projections 3 to which they are boltedat their respective ends or otherwise suitably secured.

Coming now to the firebox structure B, the same comprises sides l I having their lower edges supported on castings l and 6 at the bases of the projections 3 to which "they are bolted or otherwise suitably secured, said sides ll incline upwardly and inwardly in meeting direction to points l2, from which points they sharply in- 30 'cline upwardly forming the dome or roof sections 53, terminating at their meeting edges in flanges M firmly connected by bolts l5 forming the ridge l6.

The sides I I are formed at their end edges with the oppositely projecting lateral flanges i1 and E8. The ends 19 and 28 conform in configuration to a cross'section of the firebox as shown in Fig. l and are adapted to seat behind flanges I1 to Whichthey are bolted or otherwise suitably secured. Front end I9 is formed-with an opening 2! closed by fire door 22, and rear end 20 is formed with a substantially centrally disposed opening 23 in which'is inserted one end of smoke stack or pipe 24, and below said opening 23 is soot door 25 permitting removal of soot and access to said firebox.

The firebox B is especially constructedas above describedso that the flames will be directed to and follow" the inner walls thereof and an even distribution of heat by said roof structure effected. v

The above described firebox construction is important in effecting an even distribution of heat over the inner surface wall area and substantial 55 confinement of heat by the roof structure effected, since as the bed of coals or fire 261 settles, flue-like spaces 21 are formed adjacent walls i l directing the flames along said Walls ll effecting a quick and continued heating of said firebox, and in order to further distribute the heat at the rear thereof and prevent its rapid discharge through smoke pipe 24, the bafiie plates 28 and 29 forming a tortuous path for said heat and smoke before being discharged therefrom are provided. Bafiie plate 29 is secured to angle irons 3E3 bolted or otherwise suitably secured to walls I l with its lower end spaced from the flange l constituting the bottom of said firebox at the rear thereof and likewise spaced from end 20. Baflie 28 is spaced inwardly from baflie 29 with its lower end substantially flush with flange I and is secured similar to plate 29 by angle irons 30, with its upper end spaced from roof sections [3. a M

An ash pan or structure 3! is adapted to seat on angle barsB beneath said firebox with its free edges underlying or suitably secured to sides 52 and end 9, with the upper edge of its rear end 32 terminating flush with the free edge of flange 1, to which it may be secured if desired.

Also a continuation of end 32 may constitute the bafiie Etif desired.

A series of spaced bearing lugs 33 are formed on or suitably secured to the inner surfaces of walls II adjacent their lower edges on which is mounted a movable grate structure 36 connected to shaker arm 35, and being of conventional construction further description would seem to be unnecessary.

, The supporting structure A and firebox structure B having been described, I now come to the hopper structure C, which will be described as follows;

The hopper C is constructed preferably from sheet metal, but may be formed from any suitable material, and comprises sides 36 of a length substantially corresponding to that of firebox B bent or otherwise formed at its corners to provide the ends 37, the inner edges of which conform to the contour of said firebox and seat against the flanges 3 to which they are bolted or otherwise suitably secured, the lower edges be.- ing suitably secured to projections 3, or if desired the angle bars It may continue across the end to the firebox to which they may be secured.

Sides 36 are adapted to seat on angle bars l0 and are bent as at 38 to seat against the upturned portions of said angle bars to which they are firmly secured by bolts, rivets or other fastening means.

Said sides 36 extend on an incline upwardly and outwardly beyond or above the ledge [6 so that the hopper is wider at its upper edge than atits lower edge. 7

In order to protect the firebox when the hopper is being filled or is full of sand and to assist in directing the dried sand to the bottom of the hopper, the following structure is provided including an inverted V-shaped crown member 39 positioned over the ledge iii secured at its ends to 7 said hopper by flanges it and bolts or other fasfirebox, the lower edges of said screen being spaced from the bottom of the hopper.

It will be noted that when the hopper is mounted as above described a longitudinal opening or slot will be formed intermediate the lower edges of the hopper and firebox and the respective projections 3 on each side of the firebox, and through which the sand is adapted to automatically feed or discharge as it becomes dry. However, in order to control the flow and prevent extraneous matter and the like from clogging the openings, I have provided the respective, and in the present instance, rotary cast iron grates 46, each located in one of the said openings and suitably mounted in ends 31 on shaft 45 extending therethrough slightly above the projections 3, as clearly shown in Figs. land 3 of the drawing.

From the above it will be apparent that I have designed a sand drier embodying a unique firebox structure adapted to quickly and uniformly dry the sand, protective screen means for said firebox additionally tendingto prevent passage of the wet sand to the openings'and assisting in feeding the dried sand to said outlet openings, and grate means for controlling the flow and preventing the clogging at points of discharge by lumps or extraneous matter, such device being simple in construction, manufacturable at a minimum of cost, and efiicient for the purposes intended.

Although in practice I have found that the form of my invention illustrated in the accompanying drawing and referred to in the above descripticnas the preferred embodiment, is the most efficient and practical; yet realizing the conditions concurrent with theadoption of my invention will necessarily vary, I desire to emphasize that various minor changes in details of construction, proportion and arrangement of parts, may be resorted to within the scope of the appended claims without departing from or sacrificing any of the principles of the'invention.

Having thus described my invention what i desire protected by Letters Patent is as set forth in thefollowing claim:

A' drier for sand and the like comprising a frame including front and rear ends formed with lateral projections and constituting supporting means for a hopper, a rear end formed with an opening, a firebox being cast to provide removable side elements connecting said ends including side and wall roof sections each of said sections tapering upwardly and inwardly and detachably connected along their meeting edges, said sections when assembled causing the particles of combustion to travel over their inner surfaces from front to rear and tortuously to exit through opening in the rear end, barmembers connecting said lateral projections spaced to form exterior openings on the opposite sides of the firebox, a hopper surrounding said firebox with sideedges connected to said bars and end edges to said projections, a screen enclosing said side elements conforming to the configuration of the firebox closed at its upper and open at its lower end and spaced from said firebox to form a converging passageway along the sides thereof, whereby the sand as it becomes substantially dry is directedtoand permitted to travel over the surface of said firebox.

' GEORGE A. DIEHL. 

